Getting yourself something to eat or drink at an airport terminal is an expensive endeavor since restaurants and shops mark up their products significantly. They know you can’t bring in liquids and have few choices in the airport so they take advantage of this situation. While you can’t reduce the prices, a few tricks can help save you some money.

Ron Schenone, writing for tech blog Locker Gnome, details how he cut several dollars off his food and drink bill at the airport by avoiding sit down restaurants, finding vendors with longer lines (as that was a good sign of a deal), and venturing outside the terminal of his flight. One of the best suggestions, however, was simply bringing an empty bottle to avoid buying water:

First, you don't have to buy a $3 bottle of water. Instead, bring an empty water bottle with you. Then, once you have cleared security, you can fill the bottle with water from a drinking fountain. It's the same water, but free. Some passengers were even carrying mini-Brita filtering bottles to remove contaminants from the water, which can simulate the taste of the best bottled waters. Either way, bringing an empty water bottle can save you money with little inconvenience.

While a lot of this may be obvious to frequent travelers, if you rarely find yourself eating at an airport there’s a lot of good information you should know. Check out the full post for Ron’s methods of saving money.